std::ranges::crend

Returns a sentinel for the constant iterator(since C++23) indicating the end of a const-qualified(until C++23) range that is treated as a reversed sequence.

If ranges::crend(e) is valid for an expression e, where decltype((e)) is T, then CT models std::ranges::range , and(until C++23) std::sentinel_for <S, I> is true in all cases, where S is decltype(ranges::crend(e)), and I is decltype(ranges::crbegin (e)). Additionally, S models constant-iterator if it models input_iterator.(since C++23)

Customization point objects

The name ranges::crend denotes a customization point object, which is a const function object of a literal semiregular class type. See CustomizationPointObject for details.

[edit] Example

#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
 
int main()
{
 int a[]{4, 6, -3, 9, 10};
 std::cout << "Array backwards: ";
 namespace ranges = std::ranges;
 ranges::copy (ranges::rbegin (a), ranges::rend (a),
 std::ostream_iterator <int>(std::cout, " "));
 std::cout << '\n';
 
 std::cout << "Vector backwards: ";
 std::vector v{4, 6, -3, 9, 10};
 ranges::copy (ranges::rbegin (v), ranges::rend (v),
 std::ostream_iterator <int>(std::cout, " "));
 std::cout << '\n';
}

Array backwards: 10 9 -3 6 4
Vector backwards: 10 9 -3 6 4

[edit] See also

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